Milesight UC100 - Modbus Channel Alarm

26
(0x20001500)
(ABCD)
Holding/Input Register (INT32
with upper 16 bits)
/
21 (0x15)
15 00 00 00
Holding/Input Register (INT32
with lower 16 bits)
/
32 (0x20)
20 00 00 00
5.3 Modbus Channel Alarm
UC100 supports to report Modbus channel alarm packets if a Modbus channel value reaches the
condition.
Note: when data type is coil or discrete, the device will not report the alarm packet.
Item
Channel
Type
Byte
Description
Modbus Channel
Alarm
ff
ee
4~7
Alarm Type (1B) + Data Length (1B) +
Data Type (1B) +Data (Mutable)
Alarm Type:
Bit7-6: 00=No, 01=Threshold alarm,
10=Threshold Alarm release, 11=Change
alarm
Bit 5-0: Channel ID
Examples:
1. Channel 1 data reaches the threshold.
ff ee 40 02 03 15 00
Channel
Type
Channel ID & Alarm
Type
Data Size
Data Type
Value
ff
ee
40 => 0100 0000
01=Threshold alarm
100000=
00 => Channel 1
02 =>
2 bytes
03 => Hold
16
15 00 =>
00 15 = 21